emanja Vidic has expressed his hapiness with life at Manchester United and vowed to continue proving his commitment to the club on the pitch.[LNB] Reports continue to circulate that Vidic will leave United at the end of the season amid speculation hisbis wife is unhappy in England.[LNB]Barcelona, Real Madrid and AC Milan are all thought to be keen on signing Vidic but the Serbia defender is already looking ahead to another season with Sir Alex Ferguson's men.[LNB]"Tell me the club where I can go that is better than Manchester United?" Vidic told the Daily Mirror. "There aren't many clubs in the world where you can go to that are better.[LNB]"I'm happy here. United has been a big part in my development. Everything I have done here I respect. I will try and give my best on the pitch for as long as I can.[LNB]"I'm tired of speaking about my future. I give my best at United and always try to do that. I think that commitment shows how I think.[LNB]"I can't stop people speaking about my future but I have two years left on my contract and I'm happy.[LNB]"I need to think about next season, prepare myself, be focused and make sure I prevent injuries."[LNB]United still have faint hopes of retaining their Premier League crown and will do so if they beat Stoke and Wigan get a result at Chelsea.[LNB]However, Vidic believes their season should not be regarded as a failure if it ends with only the Carling Cup.[LNB]"In the last two weeks we didn't play well when we needed to," he said. "It's out of our hands now but we still hope.[LNB]"We must remember we have won the title in the last three years and been in the Champions League final twice. So we have had success.[LNB]"But to win the title four times in a row was always going to be difficult. We always knew that.[LNB]"This is life. You cannot win all the trophies all the time. You cannot be on the top every year. Even though we want to and have pushed very hard, sometimes you need to be strong, take those bad moments and learn from them."